Really really good! I am a full time kitesurf instructor and put it in my wetsuit all the time. Phone is basically under water. Only had one occasion of the leather peeling of in the corner. But easy fix with some of my sisters nail glue. Never had any other issue! Even the inside looks good and still feels soft.
It feels grippy but less than the limitless case, also if your hands are wet it will feel considerably less grippier as it doesn’t have the side grip or anything like that.
The walnut,aramid fiber and bamboo feel the same , the leather and speckled fabric have different feeling to which I’d say the speckled fabric has the best feeling.